<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style type="text/css">
        html, body {
            margin: 0;
            height: 100%;
        }

        canvas {
            display: block;
        }

    </style>
</head>
<body onload="draw();">

</body>
<script src="http://www.yanhuangxueyuan.com/versions/threejsR92/build/three.js"></script>
<script src="js/controls/TrackballControls.js"></script>
<script src="js/libs/stats.min.js"></script>
<script>
    var renderer;
    function initRender() {
        renderer = new THREE.WebGLRenderer({antialias:true});
        renderer.setSize(window.innerWidth, window.innerHeight);
        document.body.appendChild(renderer.domElement);
    }

    var camera;
    function initCamera() {
        camera = new THREE.PerspectiveCamera(45, window.innerWidth/window.innerHeight, 1, 10000);
        camera.position.set(0, 0, 400);
    }

    var scene;
    function initScene() {
        scene = new THREE.Scene();
    }

    var light;
    function initLight() {
        scene.add(new THREE.AmbientLight(0x404040));

        light = new THREE.DirectionalLight(0xffffff);
        light.position.set(1,1,1);
        scene.add(light);
    }

    function initModel() {
        var map = new THREE.TextureLoader().load("img/UV_Grid_Sm.jpg");
        var material = new THREE.MeshLambertMaterial({map:map});

        var cube = new THREE.Mesh(new THREE.BoxGeometry(100, 200, 100, 1, 1, 1), material);
        scene.add(cube);
    }

    //初始化性能插件
    var stats;
    function initStats() {
        stats = new Stats();
        document.body.appendChild(stats.dom);
    }

    //用户交互插件 鼠标左键按住旋转，右键按住平移，滚轮缩放
    var controls;
    function initControls() {
        controls = new THREE.TrackballControls( camera );
        //旋转速度
        controls.rotateSpeed = 5;
        //变焦速度
        controls.zoomSpeed = 3;
        //平移速度
        controls.panSpeed = 0.8;
        //是否不变焦
        controls.noZoom = false;
        //是否不平移
        controls.noPan = false;
        //是否开启移动惯性
        controls.staticMoving = false;
        //动态阻尼系数 就是灵敏度
        controls.dynamicDampingFactor = 0.3;
        //未知，占时先保留
        //controls.keys = [ 65, 83, 68 ];
        controls.addEventListener( 'change', render );
    }

    function render() {
        renderer.render( scene, camera );
    }

    //窗口变动触发的函数
    function onWindowResize() {

        camera.aspect = window.innerWidth / window.innerHeight;
        camera.updateProjectionMatrix();
        controls.handleResize();
        render();
        renderer.setSize( window.innerWidth, window.innerHeight );

    }

    function animate() {
        //更新控制器
        controls.update();
        render();

        //更新性能插件
        stats.update();
        requestAnimationFrame(animate);
    }

    function draw() {
        initRender();
        initScene();
        initCamera();
        initLight();
        initModel();
        initControls();
        initStats();

        animate();
        window.onresize = onWindowResize;
    }
</script>
</html>